Calling device



S. SUEKOFF CALLING DEVICE Apr. 1o, 1923 Filed Oct.

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Patented Apr. 10, 1923.

UNITED STATES PATENT ortica,

SAMUEL SUEKOFF, CHICAGO, ILLINOIS, ASSIGNOR TO KELLOGG SWITCHBOARD AND SUPPLY COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CALLING DEVICE.

Application filed October 3, 1918. 4Serial No. 256,656.

To al! elf/icm t may conce'm.'

Be it known that I, SAMUEL SUmioFF, a'citizen or" the United States or' America, residing at Chicago, in the county ot Cook and State or' Illinois, have invented certain new and useful Improvements in Calling Devices. of which the following is a. speciiication.

My invention relates to governors and has to do more particularly with governors for use in connection with automatic calling devices, such devices as are commonly employed in automatic and semiautomatic telephone systems for controlling the vautomatic switches which are located at the central office by directive impulses.

In the present automatic telephone systems in use, especially those commonly known as two-wire systems, it is necessary to maintain the speed of the calling device constant as slight change in the speed ot the calling devicey will aiiect the operation of the relays at the central exchange, causing an incorrect operation of the same. One of the objections. that is commonly found with the governors of the prior art is that the governor does not maintain the speed of the device to be governed constant for the first few rotations of the. device, that is, mechanical governors will operate to satisfactorily govern the speed of a device after it has once started rotating, but they do not operate as efficiently to govern the speed ot a. device that is continually starting and stopping.

It is an object ot my invention to provide a governor that is equally as effective at the start oit the device to he governed as at the time that the device has gained momentum and is rotating at full speed.

The governor of invention is in the form of a magnetic governor and includes arpermanent magnet which is utilized in association with a rotatable metallic hub, which hub rotates in the magnetic field of the said permanent magnet when the calling' device is operated to govern the same. Governors as now most universally used are of the mechanical type and are of more or less complex structure, and in which the parts from continued usage, wear so that the speed oil the device is constantly changing. More or less adjustment from time to time is required of the mechanical type of governor in order to keep the speed of rotasuch as a glass placed in and will not be affected by changes in tem-l perature or particles of foreign material. My invention embodies all of the desirable eatures and advantages ot an improved governing device in a. simple, etiicient and 1f economical manner, and these features and advantages will he more fully described in the ensuing specification and claimed in the appended claims.

Referring now more particularly to the accompanying drawing in which I illustrate a calling device equipped with a governor of my invention, and in which like reference characters in the several views denote lire parte, and in which:

Fig. l is a rear plan view of a calling device with the governor oi my invention applied thereto;

Fig. 2 is aright side view of Fig. l;

Fig. 3 is a left side view of Fig. l;

Fig. 4 is a bottom view oi Fig. l;

Fig. 5 is a sectional view along the line of Fig. l;

Fig. 6 is a sectional view along the line 6 6 of Fig. 1

Fig. 7 is a face view of the calling device` and l Fig. S is a sectional view to more clearlyy show the structure of the device. i

Referring now more in detail to my in- N vention as illustrated in the accon'ipanying drawing, it comprises a. main mounting plate 2 of non-magnetic material. which supports the mechanism. A main shaft 3 is provided. having' its one end fastened to a linger hold actuating member #i in any suitable manner. The shaft 3 passes through a suitable bearing 5, which bearing is secured to the niounting plate 9 in an): suitable manner. member et is provided with a plurality of openings or finger holds 6. preferably ten in number. A mmiber indicating disk T is placed with its indicating numerals oelow the linger hold actuating member 4, and rests in circular depression S in the mounting plate 2. The indicating disk 7 has a protective disk or" transparent material, front of it so as lli() The finger hold actuating` ,A pj'inioneearryins shaft to protect the same. A ring shaped memloerl or collar 10 is provided, which has a beaded portion 11 and also a flanged portion 12, a. circular pla-te 18 is fastened to the mounting plate 2 and is provided with radially extending arms 14, which arms are under tension and engage the flanged portion 12 of the ring 10 to hold the said ring in place. lThe bead 'll'rests upon the protective disk 9 when the ring 1() is in place and thus holds the indicating disk 7 and protective disk 9 against displacement in the depression 8 of the mounting plate 2.

The ten openings which from the finger holds 6 are numbered 1, 2, 3, etc., to 0 and the calling device is adapted to transmit from 1 to 10 impulses. The actuating inemher 4 is provided with a card 15 and is held in place by means of a clamping ring 16 which is fastenedk to the linger hold' actuating member 4 by means of a clamping screw 17, which has screw threaded engagement with the shaft 3. A stationary linger stop 18 is secured to the plate 2 by means of a screw 19 and when the finger hold actuating member 4 is advanced in a clockwise direction, the advancing finger ot' the operator engages the stop 18 to arrest the movement of the finger hold actuatingmember 4.

Referring now more particularly to the operatingmechanism, the main shaft 3 extends through the bearing 5, and the spiral motor Aspring` 2O is coiled around the bear ing 5 and a portion oi the shaft 3 which extends through the bearing 5. One end 21 of the spring 2O is inserted in a slot 22 cut into the' portion of the shaft 3 which eXF tends beyond t-he bearing 5 and the other end 23 of the spring 2Oy engages one of a plurality of lugs 24 which are suitably secured to the mounting plate 2. The spring 2O restores the finger hold. actuatingT member 4 to normal aft-er the same has been advanced and then released. To secure the proper tension of the spring 20, the end-23 of the said spring 2O is moved in a clochwise direction, as viewed in Fig. 1 over the lugs 24 until the proper adjustment or tension is secured, the end 28 of the spring 2O is then placed so that it engages one oi the plurality ot lugs 24 to thus hold the spring 2O under its proper tension and also hold the finger hold actuating'member 4 in its normal position.

Positioned between the mounting plate 2 and the finger hold actuating member 4 is a gear wheel 25 which has an orifice centrally located and of a` size to lit over the portion 26 of the bearing 5 which extends up from" the plate 2. The gear wheel 25 fits loosely over the portion 26 which serves as `a bea-ring for the said gear wheel 25 and aboutwhich the said gear wheel 25 rotates. y 271s provided. which is Journaled at its one end in the rear `mounting plate 2 and being preferably formed integral with the said mounting plate 2, and at its other `end in an angular bracket 29, which bracket is secured to the mounting plate 2 in any suitable manner, as byv means of screws 80. The shaft 27 is provided with a pinion 31, preferably formed integrally with the said shaft 27, the said pinion 31 meshing with the gear wheel 25. The shaft 27V also carries a worm gear 32 fastened to theshaf't 27 in any suitable manner. The worm gear 32 meshes with a worm 88 which is preferably formed integrally with the horizontal governor shaft 34, associated with the governor hieclianism, which mechanism is adapted to retard the return movement of the nger hold actuating member 4 at a pre-determined speed.

To retain the finger hold actuating inember 4 in its normal position against t-he tensionof the motor spring20, the member 4 carries a lug 35 (shown dotted in Fig. 8.)

secured to it in any suitable manner, which lug engages the pinion 31 upon the shaft 27 vwhen the finger hold actuating member 4 is resting in its normal position. Should the member 4 be advanced in a clockwise direction against the tension of the motor spring 20. the lug moves with the nger till hold actuating member 4 away from pinion 31 and when the member 4 restores in a counter clockwise direction, its return movement is arrested by the lug 35 engaging the teeth of the pinion 31.

.151 pair of impulse springs and 37 and a pair of shunt springs 38 and 89 are insiilatingly mounted upon an angular bracket 4() which bracket is struck up from the mounting-plate 2, the said impulse springs 86 and 37 and shunt springs 38 and 39 are secured to the bracket-40 by means of screws 41, which screws 41 have screw threaded engagement with the bracket 40. A wing shaped member orcam 42 is secured tothe shaft 27 and held in place thereon by means of a nutk 43 which has screw threaded engagement with the threaded portion of the sha-ft 27. rlhis wing shaped member is op-v eratively associated with the impulse springs 36 and 237 and operates the same in a manner to be more fully hereinafter described.

inn y lEhe end 21 oit the motor spring 2O which is engages the shunt spring 39 orp the pair of shuntl springs 38 and 39 to lift it from engagement with spring 88.

The governor mechanism of my invention is of the magnetic type and comprises a horizontal. shaft supported in bearings45 and 46, the said bearings 45 and 46 having screw lthreaded engagement with ears 47 and 48. The ears 47 and 48 .are integrally formed with the mounting plate 2. The bearings and 46 havingy screw threaded engagement with the lugs 47 and 48 permits them to be adjusted longitudinally. The shaft 34 alsosupports a metallichub H which is formed of a. soft iron core 49 covered by an aluminum shell 50,` which core 49 and shell 50 are secured to the said shaft 34 in any suitable manner. The soft iron core 49 is provided to form a better magnetic path for the lines of force, that is. to draw the magnetic flux which passes from one pole of the magnet to the other through the rotary armature. A permanent U shaped magnet 51 is supported upon brass studs 52, which studs 52 are secured to the mounting plate 2 in any suitable manner. The U shaped magnet 51 is secured to the studs 52 by means of screws 53 which have screw threaded engagement with the studs 52. Soft iron pole pieces 54 and 55 are secured to the polesr of the U shaped magnet means of screws 56 and 57, and the screws 56 and 57 have screwthreaded engagement with the respective poles of the U shaped permanent magnet 51. The pole pieces 54 and 55 have their opposite faces 56 and 59 concave to form a cylindrical opening V between them and yof a size slightly largerthan the diameter of the metallic hub I-I supported by the shaft 34. The metallic hub H is located upon the shaft 34 so that vwhen the said shaft 34 is supported in its bearings 45 and 46, the said hub Il is suspended in the cylindrical opening 60 in close proximity with the concave faces of the pole nieces 54 and 55.

Now when the finger hold actuating member 4 is rotated in a clockwise direction to set the calling device to transmit a certain number of impulses, the gear wheel 25 being loosely mounted upon the bearing 26 remains f stationary while the shaft 3 which is secured to the member 4 is also rotated in a clockwise direction. A dial ratchet 4spring 61 is fastened to the under face of the member 4 and notches 62 are cut in the face portion. 63 of the gear wheel 25 to co-operate with the said spring61. The face portion 63 of the gear 25 with its plurality of notches forms a ratchet to permitthe impulse mechanism to always rotate in one direction and backward and forward oscillatory movement of the setting member 4. The ratchet spring 61. as before mentioned, is fastened to the member 4 and theinose of the spring 61 rides over the notches 62 of the face portion' 63 of the .gear 25 until the nose ofthe spring 61 rests inthe desired notch 62 at the time that the linger of the operator engages the linger stop 18.` The end 21 of the motor springr 2O is secured tc the shaft 3 and is-pla'ced under further tension due to the is transmitted to the pinion 31 which rotates the shaft 27. The rotation of the shaft 27 causes the vworm gear 32 to rotate the governor shaft 34 through the vmedium of the worm 33 on the shaft 34. The metallic hub H being secured to the governor shaft 34 rotates therewith and as it rotates in the magnetic field, extending between the pole pieces 54 and 55, cuts the lines of force in this magnetic field, thus causing the hub to lag. The faster the hub is rotated, the greater the braking force applied to the governor shaft will be owing to the fact that the faster. the hub rotates the greater will be the number of lines of force cut by the said hub. The sets up current that tends to oppose the rotation of the governor shaft. The aluminum shell 50 around the core 49 which rotates in the magnetic field is used to reduce the weight of the hub so that it may be as light as possible and still perform its functions eliiciently. In a governor of the class described, it is essential that the governor starts up quickly and that its speed be constant so that the impulsesl are timed propcrly. lll/lith a hub of comparatively light weight, this quick starting is accomplished. lVere the hub heavy, the starting of the hub would ybe slow and after the speed had increased the inertia would be great enough to cause the governor mechanism to stop with a heavy blow lwhen the member 4 reaches normal and this continual pounding would soon cause the mechanism to get out of adjustment. With the light weighted hub H, this quick starting is accomplished and when the member 4 reaches normal, the governo-r mechanism comes to rest without a heavy blow as would be the case were the hub heavy.

In order to operate the impulse springs 36 and 37 of the device, I provide the wing shaped member 42 as already described. The springs 36 and 37 are provided with angular extensions 36 and 37 which extend in proximity with the wing member 42. The impulse springs 36 and 37 are normally closed and are interrupted according to the number of impulses to be sent. Now, if the actuating member 4 is rotated in a clockwise direction. the spring 61 rides over the notches 62 and the shaft 3 rotates, causing the spring 20 to be wound up, but on the return movement the spring 61 enga-ges a notch 62 corresponding to the number of impulses to be sent. The gear 25 is then rotated in a counter-clockwise direction when the member 4is released, due to the spring' 20, therebytransmitting .power to the pinion cutting of the lines of force l mal.

l ratus. Winds up the tjveen springs 38 and 39 and engages spring 39 to hold the shunt springs normally disengaged. Now, when the actuating member 4 is movedoif normal the shaft 3 rotates carrying the buffer 44 with it permitting the shunt springs 38 and 39 to close. The springs remain insucli. position until the buffer 44 again engages the spring 39 to open tlie contacts ofshunt springs 38 and 39 upon the completion of the return movement of the member 4. I yprovide lugs or ears struck up fr'omthe mounting plate which form means for fastening the calling dial to a telephone or instrument.

. I Will new describe` briefly the operation of the devi-ce. Let us assume that the operator rWishes to effect four operations of the impulse vsprings 36 andl 37 that is to transmit four impulses. VThe operator Will insert his finger inthe finger hold 6 before the niimeral 4 and then rotate lthe member 4 in a clockwise direction until the nger engages the stationary stop 18. The rotation of the member 4 causes the rotation of the main shaft 3 and causes spring 6l to ride over the notches 62, permitting shafts 27 and v34 of the governormeclianism to remain at norfis the shaft 3 vleaves normal the buffer 44 disengages shunt spring;` 39, allowing shunt springs 38 and 39 to close their contacts to Short circuit the substationappamotor spring 2O so that' when of the operator is removed from the finger hold 6 of the member 4; the spring'` 2O restores the apparatus toln'o'rmal'. The spring 6l now engages the notch 62 inl which it is resting and the gear 2 5 is rotated with the member 4 in `a c'ounter-clockwise direc# tion to transmit motion to the" shaft 27 and governor shaft 34 through the agency'V the gearing. `The shaft 27 is rotated',l due to the motion transmitted'from the gearfl, to bring: about the'rotation of` the Winged member 42 causing the 'impulse springs v36Vand 37 to be vinterrupts'd foury timestotransmit the" four impulses tothe centralv office to operatey ther central office" switches. The rotation ofthe shaft 34 causes the hub to cut the magnetic finzi or linesof force that a-i'efiilifeadns. `aCr0SS*f10rQle 54, te ,rele 55 tliroagh tliehiib `1 thereby causing the the finger the stop 35 engages l"'ear mechanism,

rIhe movement of the member 4 vThe fact that the hub H cuts a very few lines of force until the shaft 34 gains considerable speed per-mits the shaft 34 to practically immediately gain its full speed. Uponthe return the pinion 3l thereby immediately arresting further rotation of the impulse wings 42 and 42? and the buffer 44 again engages the shunt spring v39 interrupting shunt springs 38 and 39. The device is now at normal, and is again ready to be ad-.

justed to effect the transmission of another set of impulses.

Inillustra'ting my invention, I have shown it operating in connection with a certain form of calling device7V but I do not Wish to be limited to this vform of deviceas the governor of my invention is adapted for other uses. Neither do I Wish to be limited tothe exact structure as shown, as many to normal of the device,`

modifications and changes may readily suggest themselves, and I therefore aim to cover all such changes and modifications as come` Within the spirit and scope of the appended claims.

Having described myv invention what I claim as new and desire to secure by Letters Patent is:

l. AL device of the character described including spring-restored mechanism, a Wormi a rotatable shaft connected to said mechanisml by said Worm-gear mechanism, a rotatable cylindrical member comprising a coreprovided With securing' means to secure the same to said rotatable shaft and a cylindrical ring; of al sizeto lit over said core, a permanent magnet having softiron pole-pieces secured to its ends by means of screws resting in countersunl openings in said pole-pieces and enlarged in relation with the ,thickness of said permanent magnet, said thickness of said pole-pieces at right angles toy the axis of said cylindrical member being* substantially the same as the diameter of said cylindrical member, concave faces for said pole pieces forming an openingv of a size to receive said cylindrical member, whereby the said member as a Whole may be rotated in' said opening by means of said springs-restored mechanism to cut the magnetic flux ofsaid magnet to regulateV the speedl of operation of said spring-restored mechanism through the medium of said Worm-gear mechanism.`

A device ofthecharacter described including spring-restored mechanism, a supportingplate for said mechanism, a pair of lug bearings integrally formed ivith said plate, a warm-gea shaft connected to said spring-restored meheni's'm: bylmrs" f' .Said vermi-:ses and rotatably supported' fat itsEL eiidsili saikl'lug r mechanism.` a rotatable bearings, manually operated means for effecting the operation of said mechanism in a rotatable direction, a cylindrical member comprising a core provided with a tapped oriice for permitting the said core to have threaded engagementwith said shaft t0 secure the same upon said shaft intermediate of its ends, and a cylindrical ring of the size to fit over said core, a permanent magnet secured to said supporting plate, soft iron blocks of a thickness greater than the thickness of said permanent magnet and secured to the ends thereof to form pole-pieces for the same, concave faces for said pole-pieces to form an opening of a size to secure said cylindrical member' Whose diameter is substantially the same as the thickness of said pole-pieces, said spring-restored mechanism when in motion rotating the shaft thereby rotating the cylindrical member in said opening to cut the magnetic lines of force to retard the rotation of the shaft and thus regulate the speed of the spring-restored mechanism, through the medium of said Worm-gear mechanism. l

Signed by me at Chicago, Illinois, this 1st day of October, 1918.

SAMUEL SUEKOFF. 

